@cntrymom08466, yes, my blood pressure averages about 100 over 70. Of course, my psych knows that because every time I go in they check it. The big caution is: when you wake up, be sure to slowly slide your legs over the edge of the bed and dangle them, and also kind of move your arms around, too, to get the blood flowing. Then just be careful standing up and walking. I've never fallen.
I will say, however, that on some nights I choose not to take it, especially if I don't get to sleep till early in the morning and I have something I want to accomplish the next day as I find it makes me really tired and sluggish if I take it after 2 or 3 a.m. But if I can afford to be sluggish the next day, I will take it as late as 4 or 5 a.m.
But it really does help with nightmares. The way it works on me is, as I first start waking up, I have a few visuals of my last nightmare, but if I don't dwell on them, the images easily disappear. I mean, after a second or so, I would have to really try to remember the nightmare, and why on earth would I do that, especially since they're all recurring ones I've been working on in therapy for ages and otherwise I'd be haunted all that day and possibly more days.
I was really nervous about taking it, too, because of my low blood pressure but I found it helps a lot with hardly any adverse affects. Maybe you could try it on a night where you don't have to do much the next day and see how it affects you? If it helps, it could be, well, okay, maybe not total a gamechanger, but certainly a positive change in your outlook.